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Abstrakt

This paper gives the results of experimants made over 2 years (2004-2006) to determine the best stratification conditions for overcoming dormancy in the seeds of European privet (Ligustrum vulgare), bush cranberry (Viburnum opulus) and European euonymus (Euonymus europaeus). The experiments compared the effects of different pre-sowing treatments (stratificaton) on seed germination, i.e. different combinations of the duration and the temperature of warm and cold stratification periods. In addition, some Euonymus seeds were incubated in 1,000 mg/l solution of gibberellic acid or 10 ml/l solution of detergent. The warm temperatures used were 15, 20 and 30°C and the cold temperature was 0-5°C. The duration of stratification ranged from 1 to 5 months. Laboratory germination of stratified seeds was compared to field germination of unstratified seeds sowed immediately after autumn collection. Germination of pre-chilled Lingustrum seeds was comparable with field germination after autumn sowing. Stored seeds also responded well to the alternating warm-cold stratification (1 month 20°C, 1 month 1-5°C) but germination occurred during this stratification treatment. Field germination of unstratified Viburnum seeds was low and delayed, occurring in the second year after fall sowing. Seeds germinated well in warm conditions, after cold or warm-cold stratification. Most Euonymus europaeus seeds germinated and emerged in the second year after sowing, this germination and field germination was low. The most effective was warm-cold stratification with a short warm period. The germination capacity did not increase after incubation in detergent, but enhanced after GA3 treatment.